Dell OptiPlex 3030 All-in-One Owner's Manual page 14

3. Perform the following steps as shown in the illustration:
a. Push the hard-drive bracket to release it from its lock [1].
b. Lift the hard drive from one edge [2].
4. Slide and remove it to access the hard-drive cable.
5. Disconnect the hard-drive cable from the hard drive, and remove it from the computer.
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